1 /*=============================================================================
2     Copyright (c) 2001-2014 Joel de Guzman
3     Copyright (c) 2001-2011 Hartmut Kaiser
4     Copyright (c) 2013 Agustin Berge
5 
6     Distributed under the Boost Software License, Version 1.0. (See accompanying
7     file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
8 =============================================================================*/
9 #if !defined(SPIRIT_NO_SKIP_JAN_16_2010_0802PM)
10 #define SPIRIT_NO_SKIP_JAN_16_2010_0802PM
11 
12 #include <boost/spirit/home/x3/support/context.hpp>
13 #include <boost/spirit/home/x3/support/unused.hpp>
14 #include <boost/spirit/home/x3/core/skip_over.hpp>
15 #include <boost/spirit/home/x3/core/parser.hpp>
16 #include <boost/type_traits/remove_reference.hpp>
17 #include <boost/utility/enable_if.hpp>
18 
19 namespace boost { namespace spirit { namespace x3
20 {
21     // same as lexeme[], but does not pre-skip
22     template <typename Subject>
23     struct no_skip_directive : unary_parser<Subject, no_skip_directive<Subject>>
24     {
25         typedef unary_parser<Subject, no_skip_directive<Subject> > base_type;
26         static bool const is_pass_through_unary = true;
27         static bool const handles_container = Subject::handles_container;
28 
no_skip_directiveboost::spirit::x3::no_skip_directive29         no_skip_directive(Subject const& subject)
30           : base_type(subject) {}
31 
32         template <typename Iterator, typename Context
33           , typename RContext, typename Attribute>
34         typename enable_if<has_skipper<Context>, bool>::type
parseboost::spirit::x3::no_skip_directive35         parse(Iterator& first, Iterator const& last
36           , Context const& context, RContext& rcontext, Attribute& attr) const
37         {
38             auto const& skipper = x3::get<skipper_tag>(context);
39 
40             typedef unused_skipper<
41                 typename remove_reference<decltype(skipper)>::type>
42             unused_skipper_type;
43             unused_skipper_type unused_skipper(skipper);
44 
45             return this->subject.parse(
46                 first, last
47               , make_context<skipper_tag>(unused_skipper, context)
48               , rcontext
49               , attr);
50         }
51         template <typename Iterator, typename Context
52           , typename RContext, typename Attribute>
53         typename disable_if<has_skipper<Context>, bool>::type
parseboost::spirit::x3::no_skip_directive54         parse(Iterator& first, Iterator const& last
55           , Context const& context, RContext& rcontext, Attribute& attr) const
56         {
57             return this->subject.parse(
58                 first, last
59               , context
60               , rcontext
61               , attr);
62         }
63     };
64 
65     struct no_skip_gen
66     {
67         template <typename Subject>
68         no_skip_directive<typename extension::as_parser<Subject>::value_type>
operator []boost::spirit::x3::no_skip_gen69         operator[](Subject const& subject) const
70         {
71             return { as_parser(subject) };
72         }
73     };
74 
75     auto const no_skip = no_skip_gen{};
76 }}}
77 
78 #endif
79